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#1900
by
philw1776
on 30 Dec, 2015 17:06
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#1901
by
ugordan
on 30 Dec, 2015 17:15
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#1902
by
Steven Pietrobon
on 31 Dec, 2015 02:43
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That's great work ugordan! Would it be possible to obtain an inertial speed versus time plot?
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#1903
by
Roy_H
on 31 Dec, 2015 11:39
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That's great work ugordan! Would it be possible to obtain an inertial speed versus time plot?
Excuse my ignorance, but he already has a speed vs time plot. What is the difference for "inertial" speed. And please add a definition. Thanks.
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#1904
by
baldusi
on 31 Dec, 2015 15:19
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That's great work ugordan! Would it be possible to obtain an inertial speed versus time plot?
Excuse my ignorance, but he already has a speed vs time plot. What is the difference for "inertial" speed. And please add a definition. Thanks.
Inertial speed means discounting the rotation of the Earth.
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#1905
by
cscott
on 31 Dec, 2015 16:08
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I assume that's what's been already been plotted, since the graphs start at speed=0.
EDIT: ah, when you said "discounting" you really meant "accounting for and including".
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#1906
by
baldusi
on 31 Dec, 2015 17:28
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If it was inertial it would have started at some 350m/s or so from the rotation of the Earth at the Cape.
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#1907
by
Arb
on 31 Dec, 2015 19:44
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A day before launch and some days after LRR Elon delayed the flight by 24 hours for a 10% improvement in the chance of landing success. This led to some discussion. A later thread on
SpaceX Systems Engineering contains a relevant slide showing FRR as a continuous process from WDR to Launch.
The slide also suggests that WDR and static fires will
always be part of their process.
Interesting stuff.
Edit: Clarification
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#1908
by
Kabloona
on 31 Dec, 2015 20:37
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The slide also suggests that WDR and static fires will always be part of their process.
I'd be careful about saying "always." That slide was from 2012, and since then they've combined WDR into the static fire, so there aren't going to be any more standalone WDR's.
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#1909
by
Arb
on 31 Dec, 2015 21:50
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The slide also suggests that WDR and static fires will always be part of their process.
I'd be careful about saying "always." That slide was from 2012, and since then they've combined WDR into the static fire, so there aren't going to be any more standalone WDR's.
And if they achieve their long-term goal of:
[a] fully automated launch system capable of rolling the vehicle to the pad, raising it to position, fueling, and executing a full launch sequence in a single hour
then there likely won't be time for a static fire. But for now they still do both, albeit combined.
Edit: Quote formatting.
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#1910
by
AJW
on 31 Dec, 2015 23:43
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Is it your gamma boost, or did somebody get a bath?
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#1911
by
oiorionsbelt
on 31 Dec, 2015 23:47
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Screen shot of the Instagram picture
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#1912
by
docmordrid
on 31 Dec, 2015 23:48
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Only boosted it a small amount for the shadows. Looks like it's had a wash.
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#1913
by
Jdeshetler
on 01 Jan, 2016 00:32
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After looking at Elon's photo of "used" F9 where there is lots of chipped and bubbled painted surfaces which is only superficial.
The Space Shuttle saved 600 lbs after stopping painting the white latex paint on the 3rd exterior tank. So why not no more white paint on F9 and it might save 200 to 300 lbs plus no more chipped paints to check out for loose flakes....
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#1914
by
pathfinder_01
on 01 Jan, 2016 00:54
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After looking at Elon's photo of "used" F9 where there is lots of chipped and bubbled painted surfaces which is only superficial.
The Space Shuttle saved 600 lbs after stopping painting the white latex paint on the 3rd exterior tank. So why not no more white paint on F9 and it might save 200 to 300 lbs plus no more chipped paints to check out for loose flakes....
The white paint on the Shuttle was to help keeping the tank at the proper temperature. It was simply discovered that it was not needed and removing it improved performance and saved money. Likewise Elon might have to evaluate that first.
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#1915
by
sdsds
on 01 Jan, 2016 01:27
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You might ask, "Why do the static fire test?" I think the answer is that otherwise much may have happened since you last saw the engines' shutdown transient behavior.
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#1916
by
NovaSilisko
on 01 Jan, 2016 01:45
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I don't think Musk would ever go for an unpainted Falcon 9. He refused to let Grasshopper be shown until it was painted and given the SpaceX logo, IIRC - whereas the engineers were just going to fly it "naked".
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#1917
by
Jdeshetler
on 01 Jan, 2016 01:59
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Anodized the aluminum surface is one way of adding color and some protection however white is the only color can't be applied thru this procedure.....
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#1918
by
rcoppola
on 01 Jan, 2016 02:00
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What are these cracks/peels on the grid fins?
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#1919
by
Kabloona
on 01 Jan, 2016 02:49
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What are these cracks/peels on the grid fins?
Probably a thin layer of thermal protection (SPAM?) that peeled off.